Twitter API Authenticate vs Authorize -

hi tell difference between twitter authenticate , authorize

$twitterconnect = new twitteroauth(consumer_key, consumer_secret); $twittertoken = $twitterconnect->getrequesttoken();  $redirect_url = $twitterconnect->getauthorizeurl($twittertoken, true); // authenticate  $redirect_url = $twitterconnect->getauthorizeurl($twittertoken, false); //authorize 

with oauth/authenticate if user signed twitter.com , has authorized application access account silently redirected app.

with oauth/authorize user allows see allow screen regardless if have authorized app.